[計量] 請教一個計量問題
請教板友一個計量問題!
Machine A can process 6000 envelopes in 3 hours. Machine B and C working
together but independently can process the same number of envelope in
2.5 hours. If A and C working together but independently process 3000
envelopes in 1 hour, then how many hours would it take B to process 12000
envelope?
感激不盡~~
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12/23 17:10, , 1F
12/23 17:10, 1F